Dec 12 08:15:58.950 INFO checking rust_lsp-0.6.1 against master#3a75e80557a103497cffbcab395a2f37061a77ea for pr-56677
Dec 12 08:15:58.950 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-2/master#3a75e80557a103497cffbcab395a2f37061a77ea:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-2/pr-56677/master#3a75e80557a103497cffbcab395a2f37061a77ea:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +3a75e80557a103497cffbcab395a2f37061a77ea-alt check --frozen --all --all-targets" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 12 08:15:59.397 INFO [stdout] 4de5a892fa5235265f5392339d31a14ba37531f005a315e26566457decdbaaf0
Dec 12 08:15:59.416 INFO running `"docker" "start" "-a" "4de5a892fa5235265f5392339d31a14ba37531f005a315e26566457decdbaaf0"`
Dec 12 08:16:00.236 INFO [stderr] usermod: no changes
Dec 12 08:16:00.360 INFO [stderr]     Checking rustdt_util v0.2.3
Dec 12 08:16:00.360 INFO [stderr]     Checking languageserver-types v0.6.1
Dec 12 08:16:00.965 INFO [stderr]     Checking rustdt-json_rpc v0.3.0
Dec 12 08:16:04.754 INFO [stderr]     Checking rust_lsp v0.6.1 (/source)
Dec 12 08:16:09.044 INFO [stderr] warning: variable does not need to be mutable
Dec 12 08:16:09.044 INFO [stderr]   --> src/lsp.rs:75:9
Dec 12 08:16:09.044 INFO [stderr]    |
Dec 12 08:16:09.044 INFO [stderr] 75 |         mut msg_reader: &mut MR, endpoint: Endpoint, lsp_server_handler: SERVER
Dec 12 08:16:09.044 INFO [stderr]    |         ----^^^^^^^^^^
Dec 12 08:16:09.044 INFO [stderr]    |         |
Dec 12 08:16:09.044 INFO [stderr]    |         help: remove this `mut`
Dec 12 08:16:09.044 INFO [stderr]    |
Dec 12 08:16:09.044 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 12 08:16:09.044 INFO [stderr] 
Dec 12 08:16:09.048 INFO [stderr] warning: variable does not need to be mutable
Dec 12 08:16:09.048 INFO [stderr]   --> src/lsp.rs:95:9
Dec 12 08:16:09.048 INFO [stderr]    |
Dec 12 08:16:09.048 INFO [stderr] 95 |         mut msg_reader: &mut MR, endpoint: Endpoint, request_handler: Box<RequestHandler>
Dec 12 08:16:09.048 INFO [stderr]    |         ----^^^^^^^^^^
Dec 12 08:16:09.048 INFO [stderr]    |         |
Dec 12 08:16:09.048 INFO [stderr]    |         help: remove this `mut`
Dec 12 08:16:09.048 INFO [stderr] 
Dec 12 08:16:09.760 INFO [stderr] warning: variable does not need to be mutable
Dec 12 08:16:09.760 INFO [stderr]   --> src/lsp.rs:75:9
Dec 12 08:16:09.760 INFO [stderr]    |
Dec 12 08:16:09.760 INFO [stderr] 75 |         mut msg_reader: &mut MR, endpoint: Endpoint, lsp_server_handler: SERVER
Dec 12 08:16:09.760 INFO [stderr]    |         ----^^^^^^^^^^
Dec 12 08:16:09.760 INFO [stderr]    |         |
Dec 12 08:16:09.760 INFO [stderr]    |         help: remove this `mut`
Dec 12 08:16:09.760 INFO [stderr]    |
Dec 12 08:16:09.760 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 12 08:16:09.760 INFO [stderr] 
Dec 12 08:16:09.772 INFO [stderr] warning: variable does not need to be mutable
Dec 12 08:16:09.772 INFO [stderr]   --> src/lsp.rs:95:9
Dec 12 08:16:09.772 INFO [stderr]    |
Dec 12 08:16:09.772 INFO [stderr] 95 |         mut msg_reader: &mut MR, endpoint: Endpoint, request_handler: Box<RequestHandler>
Dec 12 08:16:09.772 INFO [stderr]    |         ----^^^^^^^^^^
Dec 12 08:16:09.772 INFO [stderr]    |         |
Dec 12 08:16:09.772 INFO [stderr]    |         help: remove this `mut`
Dec 12 08:16:09.772 INFO [stderr] 
Dec 12 08:16:10.152 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.89s
Dec 12 08:16:10.157 INFO [stderr] su: No module specific data is present
Dec 12 08:16:10.483 INFO running `"docker" "inspect" "4de5a892fa5235265f5392339d31a14ba37531f005a315e26566457decdbaaf0"`
Dec 12 08:16:10.751 INFO running `"docker" "rm" "-f" "4de5a892fa5235265f5392339d31a14ba37531f005a315e26566457decdbaaf0"`
Dec 12 08:16:11.019 INFO [stdout] 4de5a892fa5235265f5392339d31a14ba37531f005a315e26566457decdbaaf0